this is three weeks after four americans, including the ambassador, chris stevens, two navy seals and a state department staffer were murdered on september 11th. we're told that safety concerns were the reason for the fbi's delay and need for proper military protection of that team in the event of a possible, another attack. leland vittert is live in jerusalem with a long delay now. what is the fbi hoping to learn there, leland? >> reporter: that is the real problem, bill. typically in a criminal investigation or something like this you want boots on the ground as soon as possible to try to sift through the clues, what kind of weapons did these people use? possibly how can you trace those weapons back to who was funding or planning this wrags? what -- operation. what clues did the attackers themselves leave behind to provide evidence to go back and track this attack back? the problem with the fbi in three weeks since the attack on consulate on 9/11, a number of people have been through there, to news crews to on lookers inside benghazi. we know there were sensitive documents seen insi